WESTSIDE WATER ASSN
PWS ID: WA5394950 · Vashion Island, Washington 98070
Population Served
562
Total Violations
65
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 239
- County
- King
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 62
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 11 | 2020 |
| Lead and Copper Rule | MR | 10 | 2007 |
| Diquat | MR | 6 | 2008 |
| TTHM | MR | 4 | 2020 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2020 |
| Coliform (TCR) | MR | 4 | 1992 |
| ETHYLENE DIBROMIDE | MR | 2 | 2008 |
| Aldicarb | MR | 2 | 2008 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 2 | 2008 |
| Aldicarb sulfone | MR | 2 | 2008 |
| OXAMYL | MR | 2 | 2008 |
| Carbofuran | MR | 2 | 2008 |
| Aldicarb sulfoxide | MR | 2 | 2008 |
| Consumer Confidence Rule | Other | 1 | 2015 |
| Revised Total Coliform Rule | MON | 1 | 2018 |
| Selenium | MR | 1 | 1979 |
| Chromium | MR | 1 | 1979 |
| Fluoride | MR | 1 | 1979 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Mercury | MR | 1 | 1979 |
| Arsenic | MR | 1 | 1979 |
| Barium | MR | 1 | 1979 |
| Cadmium | MR | 1 | 1979 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.